diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-settings.c | 2 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 11 | ||||
| -rw-r--r-- | block/compat_ioctl.c | 2 | ||||
| -rw-r--r-- | block/ioctl.c | 2 |
4 files changed, 17 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 1ebc1fdb914..dd1f1e0e196 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -101,6 +101,7 @@ void blk_set_default_limits(struct queue_limits *lim) lim->discard_granularity = 0; lim->discard_alignment = 0; lim->discard_misaligned = 0; + lim->discard_zeroes_data = -1; lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); lim->alignment_offset = 0; @@ -544,6 +545,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, t->io_min = max(t->io_min, b->io_min); t->no_cluster |= b->no_cluster; + t->discard_zeroes_data &= b->discard_zeroes_data; /* Bottom device offset aligned? */ if (offset && diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 3147145edc1..8606c9543fd 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -136,6 +136,11 @@ static ssize_t queue_discard_max_show(struct request_queue *q, char *page) return queue_var_show(q->limits.max_discard_sectors << 9, page); } +static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) +{ + return queue_var_show(queue_discard_zeroes_data(q), page); +} + static ssize_t queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) { @@ -313,6 +318,11 @@ static struct queue_sysfs_entry queue_discard_max_entry = { .show = queue_discard_max_show, }; +static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { + .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, + .show = queue_discard_zeroes_data_show, +}; + static struct queue_sysfs_entry queue_nonrot_entry = { .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, .show = queue_nonrot_show, @@ -350,6 +360,7 @@ static struct attribute *default_attrs[] = { &queue_io_opt_entry.attr, &queue_discard_granularity_entry.attr, &queue_discard_max_entry.attr, + &queue_discard_zeroes_data_entry.attr, &queue_nonrot_entry.attr, &queue_nomerges_entry.attr, &queue_rq_affinity_entry.attr, diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c index 9bd086c1a4d..4eb8e9ea4af 100644 --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -747,6 +747,8 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) return compat_put_uint(arg, bdev_io_opt(bdev)); case BLKALIGNOFF: return compat_put_int(arg, bdev_alignment_offset(bdev)); + case BLKDISCARDZEROES: + return compat_put_uint(arg, bdev_discard_zeroes_data(bdev)); case BLKFLSBUF: case BLKROSET: case BLKDISCARD: diff --git a/block/ioctl.c b/block/ioctl.c index 1f4d1de12b0..be48ea51fae 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -280,6 +280,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, return put_uint(arg, bdev_io_opt(bdev)); case BLKALIGNOFF: return put_int(arg, bdev_alignment_offset(bdev)); + case BLKDISCARDZEROES: + return put_uint(arg, bdev_discard_zeroes_data(bdev)); case BLKSECTGET: return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); case BLKRASET: |